Tact is the ability to induce change or communicate hurtful information without offending through the use of consideration, compassion, kindness and reason.
Tact is a quality respect, because being an asshole and acting negatively towards others is 100 times easier than making a positive contribution.
Lacking taste or unfashionable. Possessing a general lack of common sense. Describing someone or something that is tacky or ugly. A situation that is not favorable.
The guy that drove that Ford Focus was very tact. Guys that wear sunglasses in the club are tact. Why are your teeth yellow...that is tact! Why are you so tact?